Preparation method of polyvinyl acetal resin

A technology of polyvinyl acetal resin and polyvinyl alcohol, which is applied in the field of preparation of organic polymer compounds, can solve the problems of insufficient contact, poor acetalization uniformity, difficult washing, etc., achieves good uniformity and reduces the number of washings and water consumption, the effect of avoiding the difficulty of washing

Active Publication Date: 2013-09-25
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is intended to overcome the deficiencies in the above-mentioned prior art, for the traditional heterogeneous phase method of synthesizing polyvinyl acetal resin for starting point at PVA, the inside of the resin particle is not fully contacted with the reaction material, and the homogeneity of acetalization is poor; PVA To solve the problem of difficult washing caused by adding emulsifiers in the traditional heterogeneous method of synthesizing polyvinyl acetal resin, a preparation method of polyvinyl acetal resin is provided; thereby providing a polyvinyl acetal resin with high uniformity of acetalization Vinyl acetal resin synthesis method, the synthetic basic raw material of this method polyvinyl acetal resin is polyvinyl alcohol, aldehyde, catalyst, organic solvent and antioxidant

Method used

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  • Preparation method of polyvinyl acetal resin
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  • Preparation method of polyvinyl acetal resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0031] The synthetic process of embodiment 1,2 is identical with aftertreatment process.

[0032] (1) Synthetic process: the batch list of embodiment 1 and 2 is:

[0033]

[0034] Add polyvinyl alcohol and water to reactor A, stir and heat to the dissolution temperature of 80°C to form a polyvinyl alcohol solution, cool down to 10°C, add the formula amount of aldehyde and catalyst to reactor A at the same time, and then add anti Oxygen agent, carry out acetalization reaction, keep the temperature in the range of 10-13°C during the reaction process, when the product is precipitated as powder or floc, continue the reaction for 1 hour, and then add the formula amount of ethanol into the reactor A, Keep the temperature at 30°C, continue the reaction for 10 hours, and keep the material in the reactor A at 30°C for standby, that is, a mixed material containing the product—polyvinyl acetal resin is obtained in the reactor A.

[0035] (2) Post-processing process:

[0036] Add 140...

Embodiment 3～7

[0047] The synthesis and post-treatment basic technological process of embodiment 3~7 is the same.

[0048] (1) Synthetic process: the list of ingredients in Examples 3 to 7 (the dosage unit is kg) is:

[0049] Add polyvinyl alcohol and water to reactor A, stir and heat to the dissolution temperature of 90°C to form a polyvinyl alcohol solution, cool down to 25°C, add the formula amount of aldehyde and catalyst to reactor A at the same time, and then add anti Oxygen agent, carry out acetalization reaction, keep the temperature in the range of 25-27°C during the reaction process, when the product is precipitated as powder or floc, continue the reaction for 2 hours, and then add the organic solvent of the formula amount into the reactor A , keep the temperature at 65°C, continue the reaction for 5 hours, and keep the material in the reactor A at 60°C for standby, that is, a mixed material containing the product—polyvinyl acetal resin is obtained in the reactor A.

[0050] (2)...

Embodiment 5

[0059] Embodiment 5 and the main formula parameter of comparative example 3,4 and product result contrast:

[0060]

[0061] It can be seen from the comparison of the above table that the method of the present invention has higher utilization rate of raw material butyraldehyde, fewer post-treatment times and water consumption, and better uniformity of acetalization degree of the product. Comparing Comparative Example 3 and Example 5, the degree of acetalization of the two is basically the same, but the haze of the latter is significantly smaller than that of the former, indicating that the degree of acetalization of the latter is more uniform, while the distribution of degree of acetalization of the former is wider.

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Abstract

The invention discloses a preparation method of polyvinyl acetal resin, which is characterized by comprising the following steps of: taking the following raw materials in parts by weight: 100 parts of polyvinyl alcohol, 400-1,900 parts of water, 10-220 parts of aldehyde, 0.5-30 parts of catalyst, 400-9,500 parts of organic solvent and 0.01-3 parts of antioxidant; mixing the polyvinyl alcohol and water at 80-97 DEG C to form a solution; cooling to 10-40 DEG C; adding 10-100% of aldehyde and 10-100% of catalyst, adding the antioxidant, and performing an acetalation reaction at 10-40 DEG C; when a powdery or flocculent product is separated out, continuing reaction for 0.1-5 hours; adding the organic solvent and the remaining aldehyde and catalyst, and reacting at 30-80 DEG C till the end; and treating to obtain the polyvinyl acetal resin. The product prepared by the method disclosed by the invention has high acetalization degree and low haze and can be applied to the fields of paint, adhesives, ink, resin modifiers, safety glass and photovoltaic encapsulation materials.

Description

technical field [0001] The invention belongs to the preparation of organic polymer compounds. It relates to a preparation method of polyvinyl acetal resin. The polyvinyl acetal resin product produced by the present invention is mainly used in paints, adhesives, inks, resin modifiers, safety glass for automobiles, and safety glass for buildings. For example, safety glass and photovoltaic packaging materials such as glass curtain wall, decorative glass, sound insulation glass and digital glass. Background technique [0002] Polyvinyl acetal (Polyvinyl acetal) materials have a wide range of uses, among which polyvinyl formal (Polyvinyl formal, referred to as PVF) and polyvinyl butyral (Polyvinyl butyral, referred to as PVB) are the main ones. Taking PVB as an example, due to different indicators such as viscosity and vinyl alcohol content, it can be used as paint, adhesive, ink, resin modifier, safety glass interlayer, etc. Among them, the amount of safety glass interlayer fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28C08F16/38C08F6/10
Inventor 陈小强徐康林代三威
Owner SICHUAN DONGFANG INSULATING MATERIAL
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